<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .f{
            width: 520px;
            height: 280px;
            position: relative;
            margin: 260px auto;
            background-image: url(../HTML/picture/tb.jpg );
         
        }
        .s1{
            width: 24px;
            height: 36px;
            position: absolute; 
            top:50%;
            left:0;
            background-image: url(../HTML/picture/left.png );
         
        }
        .s2{
            width: 24px;
            height: 36px;
            position: absolute; 
            top:50%;
            right: 0;
            background-image: url(../HTML/picture/right.png );
         
        }
        .s3{
            width: 97px;
            height: 28px;
            position: absolute; 
            bottom: 0;
            left: 46%;
            background-image: url(../HTML/picture/aaaa.png );
         
        }
    </style>
</head>
<body>
    <div class="f">
        <div class="s1"></div>
        <div class="s2"></div>
        <div class="s3"></div>

    </div>
    
</body>
</html>